Motorola Gm950 Plus Programming Software -
Technical Report: Motorola GM950 Plus Programming Software
Date: April 21, 2026
Subject: Analysis and operational guide for the programming software of the Motorola GM950 Plus two-way radio.
Audience: Radio technicians, fleet managers, and system integrators.
1. Executive Summary
The Motorola GM950 Plus is a legacy analog mobile radio (25-40W) widely used in public safety, transportation, and industrial settings. Its programming software is a proprietary Windows-based application designed to configure frequency parameters, signaling systems (CTCSS/DPL), and hardware options. Crucially, the software is no longer officially distributed by Motorola Solutions; however, legacy copies exist under versions like RVN4191 or GM950+ CPS (Customer Programming Software). This report outlines the software’s functionality, dependencies, and operational risks. motorola gm950 plus programming software
2. Key Features & Configuration Capabilities
The software provides low-level access to the radio’s EEPROM. Primary configurable parameters include: Note: The GM950 Plus does not support trunking
| Category | Parameters Programmable | |-----------------------|---------------------------------------------------------------------------------------------| | Frequencies | RX/TX frequencies (136-174 MHz VHF or 403-470 MHz UHF, depending on model variant) | | Channel Spacing | 12.5 kHz (narrowband) or 25 kHz (wideband) – compliance with narrowband mandates | | Signaling | CTCSS (38 tones), DPL (83 codes), and Selcall (selective calling) | | Power Levels | High (25-40W) / Low (1-10W) per channel | | Time-Out Timer | Adjustable TOT (0-240 seconds) | | Scan Lists | Programmable scan groups (up to 10 channels) with priority channel designations | | Auxiliary Functions| Horn alert, external PA, ignition sense, and emergency footswitch inputs | Step 3: Edit the Codeplug
Note: The GM950 Plus does not support trunking or digital modes (P25/DMR).
Step 3: Edit the Codeplug
- Navigate to Conventional Personalities. This is your channel list.
- For each channel, enter the RX and TX frequencies. For repeater use, ensure the offset is correct.
- Under Signaling, assign CTCSS tones to prevent open-squelch noise.
- Adjust TX Power Level to high or low.
Legal & Licensing Implications
Before you program your GM950 Plus, understand that transmitting on unauthorized frequencies is illegal in virtually every country (FCC in the US, OFCOM in the UK, ISED in Canada).
- Amateur Radio: If you are a licensed ham, you must program only within the 2m (144-148 MHz) or 70cm (430-450 MHz) bands.
- Commercial/Business: You must have a valid site license and use frequencies assigned to you.
- Emergency Services: Do not program public safety frequencies (police/fire/EMS) – this is a serious crime.
Programming software itself is neutral; how you use it determines legality.